
export default class UUID {
    public static gen = function () {
        const lut:Array<any> = [];
        for (let i = 0; i < 256; i++) {
            lut[i] = (i < 16 ? '0' : '') + (i).toString(16);
        }
        const d0 = Math.random() * 0xffffffff | 0;
        const d1 = Math.random() * 0xffffffff | 0;
        const d2 = Math.random() * 0xffffffff | 0;
        const d3 = Math.random() * 0xffffffff | 0;
        return lut[d0 & 0xff] + lut[d0 >> 8 & 0xff] + lut[d0 >> 16 & 0xff] + lut[d0 >> 24 & 0xff] + '-' +
            lut[d1 & 0xff] + lut[d1 >> 8 & 0xff] + '-' + lut[d1 >> 16 & 0x0f | 0x40] + lut[d1 >> 24 & 0xff] + '-' +
            lut[d2 & 0x3f | 0x80] + lut[d2 >> 8 & 0xff] + '-' + lut[d2 >> 16 & 0xff] + lut[d2 >> 24 & 0xff] +
            lut[d3 & 0xff] + lut[d3 >> 8 & 0xff] + lut[d3 >> 16 & 0xff] + lut[d3 >> 24 & 0xff];
    }
}